351681263981 has 2 divisors, whose sum is σ = 351681263982. Its totient is φ = 351681263980.

The previous prime is 351681263939. The next prime is 351681263987. The reversal of 351681263981 is 189362186153.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 347352281956 + 4328982025 = 589366^2 + 65795^2 .

It is a cyclic number.

It is not a de Polignac number, because 351681263981 - 2²⁶ = 351614155117 is a prime.

It is a super-2 number, since 2×351681263981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (351681263987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175840631990 + 175840631991.

It is an arithmetic number, because the mean of its divisors is an integer number (175840631991).

Almost surely, 2^351681263981 is an apocalyptic number.

It is an amenable number.

351681263981 is a deficient number, since it is larger than the sum of its proper divisors (1).

351681263981 is an equidigital number, since it uses as much as digits as its factorization.

351681263981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 53.

The spelling of 351681263981 in words is "three hundred fifty-one billion, six hundred eighty-one million, two hundred sixty-three thousand, nine hundred eighty-one".